My stepmother is always craving a big dick from my son-in-law.

While her husband is on a business trip, her mother Yuko lives in the house of her daughter and her husband. I was living a lonely life without meeting my husband, but I wasn't the only one who felt lonely. Her son-in-law, Tooru, always masturbates alone in the middle of the night, and when Yuko learns this, she doesn't feel like it's someone else's problem... Yuko, who knows the pain of not being able to satisfy her sexual desire, tells her daughter is her responsibility, and invites her to do so every time. However, in order to satisfy his sexual desire, he continues to seduce him all the time, in order to suffice his son-in-law's big dick...